Bitumen boiler



March 15, 1927. 1,620,952

F. A. DAVIES BITUMEN BOILER Filed Nov. 19, 1925 l of which the general operations of the boiler Patented Mar. 15, 1927.

- FREDERICK ALBERT DA IES, 0F AUCKLAND, NEW ZEALAND,

CONSTRUCTION GOMI ANY LIMITED, 015 AUCKLAND, NEW. ZEAL'ATID. I

I BITUMEN. BOILER.

Applicationfil ea November 19, 1925. Serial no. 70,106.

j Thisinvention relates to the boilers used in theheating and melting. of bitumen for use in road or other structural work or maintenance. The invention is concerned with the common and well known types of boilers in which a bitumen containing chamber is provided within a furnace casing and is heated by heat from the furnace applied directly to the bottom of the chamber and also caused to pass through return lines eX- tending through such chamber. The said chamber is charged through door covered openings contained in the top thereof and dischargedby draw ofi? pipes leading from itsbottonr' I V ,The invention has been devised with the object of providing improvements in the structural details ofsucha boiler, :by the use are carried out'more efiectively and at .a q'uickerrate and also with'less liability of damage to the boiler through the accumulation of dross or solid matters uponthe heat ing surfaces 1 initsgeneral features of'construction, fol-. lows known lines in that it comprises The improvements also provide for the boiler bot-v collection of sediment within the tom and for the removal of such sediment fromxtime to time. Withouthaving to stop the, general operations of the-boiler.

These several improvements are illustrat ed in the accompanying drawings and will be. hereinafter fully described in relation thereto. i I v v In such drawings Figure 1 is an end elevation of the boiler.

Figure 2 is a cross section thereof.

Figure 3 is a longitudinal section the undercarriage being removed.

Figure thereot et'is a longitudinalsection, on the line L-A of Figure 2, ofa small .detail portionof theboiler. 5 In carrying outt'he invention the boiler bitumen holder or chamber A disposedover a furnace B within 'a main casingC that is mounted on transporting wheels. The furnace space B extends to the rear end of the casing and return fiuetubes E pass through the bitumen chamber A to a smoke box E at the front end from which an escape flue E leads away, in a manner well known in boiler construction.

The upper end ofthe bitumen chamber A opens through the top of the casing C and is covered by a door covering-A" hinged along one side edge of tl1e, openi.ng, and if desired, made up of anumber of sections extending end to end. This doorv is of flat form audit, is so hinged. that it may. be

turned out to uncover the top-of the chamber AssIeNoR TO THE STEEL andto be supported horizontally as shown in Figure 2, or may be turned in to extend across the opening,

I as shown by thedotted lines in Figure 2 and the full lines in Figure 3. ;,VVhen turned out, it forms a platformgupon which the bitumen. to be ted to the boiler may be stacked, and then such bitumen may beytransferred to the boiler by turning the doorover into its closing position.

In this invention the bottom of the,

chamber A forms the crown of the furnace B and is shaped, asshown inFigure 2, in cross-section so that it extends from each side of the casing upward in a curve to the centre line and thereby forms a peak G of right along the-middle of the chamber at a short distance below the top opening thereof. This shape is vdesigned with the object narrow-or acute-angular section extending of .ettecting twopurposes, the first being to form :a hot"peak on thesharp edge of which lumps of bitumen fed into the boiler may rest Eand be supported until theyfare,

melted and pass down into thevlower halves of the chamber. This-will allow of large lumps being placed in the boiler and being 'cut by the said hot,'sharp edge'of the peak.

The second purposeisto form a sump"or gutter H along within each side of theboiler and at the bottom thereof, into which sumps thesediment'orjoreign matters contained in the bitumen will gravitate ,or be. precipitated.

The invention embodies meanswhereby this sediment may. be drained off from time to time,.-Whenever required,' and without stopping the 'boi'lers operations. These means consist of draincocks J arranged at each end of each sump and a specially constructed scraper Kthat isifitted into each sump and is fastenedfto" a push'bar Kexe tending outthrough the front of the boiler casing so that pushing on the bar or IUL x drawing it, the scraper may bemoved along within the sump to gather the sediment from the sump bottom and collect it at either for. draining out through the cock. The scraper is also formed so that it shuts 'ofi main part of the boiler so that the collected sediment may be drained away without any bitumen escaping at the same time. It is therefore constructed as shown in Figures 2 and 4: with flanges K eaten-ding horizontally for a distance upon both sides of its topand across its full length. These flanges therefore extend between the bottcmuG and the boiler side at a distance above the bottom,

and when the scraper is moved to one end, the flange on that side will engage the boiler end and thereby close in the space surround ing the outlet to the cock J at that end.

This provision for the periodical withdrawal of the sediment will serve to prevent the liability of the boiler bottom being burnt through the collection of sediment thereon; The construction shown also provides for the protection of the apex G of the f-n'rnace crown G from the direct action (if the furnace heat in order to lessen the liability of burning, and for this purpose a line of fire tiles M is disposedhorizontally across be-- tween the sides of the crown at a suitabledistance down and these are supported by any approved means. This arran ement in eii e'ct forms an extra return flue E for the passage of heat from the furnace rear along to the smokebox E, the heat acting on the crown to heat the bitumen above it.

I The return tubes E are disposed in the holder A in any approved positions but preferably are arranged along each side thereof in nnescne above the other, as shown in Figure 2. A grid covering or basket N is provided vto extend from the crown G on each side and then upwards and outwards over the tubes E on that side. This grid or basket will serve to retain any lumps of bitumen within the liquid contents of the holder so that in its circulation the heat will flow freely around such lumps and melt them, thus obtaining a better effect in the melting of the bitumen than if the lumps were allowed to settle on the boiler bottom. This prevention of the lumps from settling will also obviate the possibility of the fur nace crown being burnt.

I claim 1. In a bitumen boiler, a casing providing a bitumen holder and a furnace having a common wall which constitutes the bottom of the holder and the crown of the furnace; said wall bein shaped to form a single central peak of narrow or acute angular section extending longitudinally thereof from end to end anda:sediment collecting sump or gutter at each side of such peak,

saidpeak projecting upward into the cen-.

tral portion of the holder for a considerable distance and terminating in a sharp upper edge which is disposed a slight distance below the top of the holder so as to support temporarily on its saidl sharp edge lange lumps of bitumen introduced-into the holder and to out said lamps "while sdsiipported.

2-.ylna bitumen boiler, a casing providing a bitumen holder and a furnace having a common wall which constitutes the bottom of the holder and the crown of the furnace, sets of superposed heating fines dispcsed horizcntally withinthe fielder at opposite sides thereof communicating at one end with the furnace, anons-mos with which the fines 'ccmnmnicate at the other end, and

a grid in said hciderunectly adjacent toand parallel with each set ct flues' to retain lumps of bitumen Within the liquid contents cf the holder. i

' 3!]?11 a bitumen boiler, a casing providing a bitumen holder and a l-iavifng a common wall which constitutes the bot-tom of the hcld'er and the crown of the furnace; said wall bein shaped to term sharp peak extending longitudinally'thereof from end to end and a sediinent c'ollecting sump or gutter at each side of such peak, said peak adapted to support temporarily and to cut lumps of bitumen introducedinto-the holder; a set of superposed fl'ues disposed horizontal 1y within the holder directly above each sump and communicating at one end with the furnace, a smoke-box with which the fines comm'unicateat the other end, and a grid in said holder directly adjacent to and parallel with each set (if lines and having a bottom portion which extends laterally to the adjacent side wall of said peak to retain lumps of bitumen within theliquid contents of the holder.

4. A. bitumen boiler, according. to claim 3, in which a hbrifiontal between the side walls of the peak for its entire length to provide an additional heating flue which communicates at opposite ends with the smok'e boX and the. furnace.

5. In a bitumen boiler, a casing providing I a bitumen holder and afurna'c'e', the hottoni of the bitumen holder being made to form a sump or gutter along each side edge thereof,

drain cocks opening from each of such "sumps partition is disposed or gutters, at each end thereof, and a scraper fitting transverselyv across each sump or gutter and secured to a rod passing out throughone end of the said casing, each scraper heingformed with a horizontally (six-- tending flange, projecting from each side of its upper edge: v

In testimony whereof, I ailix my signature.

FREDERICK Annual na 'mg 

